#include <bits/stdc++.h>
using namespace std;
int main(){
	char a[256];
	gets(a);
	int i,x=0;
	for(i=0;i<strlen(a);i++){
		x++;
		if(a[i]!=a[i+1]){
			if(x!=1)
				cout<<x;
			cout<<a[i];
			x=0;
		}		
		
    }
    
	return 0;
	}
/**************************************************************
	Problem: 1103
	User: fzy001
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/